Multiple conductor service cable insulator



Jan. 20, 1959 C. L. WILKINS ET AL MULTIPLE CONDUCTOR SERVICE CABLE INSULATOR Filed April 8, 1958 I/VVFNTORS all Vilkz'n s R. KWz'Zk ins United States Patent MULTIPLE CONDUCTOR SERVICE CABLE INSULATOR Charies L. Wilkins and Ruth Y. Wilkins, Akron, Colo.

Application April 8, 1958, Serial No. 727,228

1 Claim. (Cl. 174-41) This invention relates to a multiple service conductor insulator, and has as its primary object the provision of such a service cable insulator for the support of a multiple conductor, as, for example, a triplex service cable of the type wherein two or more insulated conductors are twisted around a bare neutral conductor, which will prevent the unravelling or slipping of the cable.

A further important object of the invention resides in the provision of an insulator adapted to be attached to a service cable, about which is wound a multiple conductor cable whereby strain insulators on the service cable may be eliminated.

A further object of the invention is the provision of such a construction wherein the service cable is fastened at one end directly to the power pole, and at the other end to the building of the consumer with suitably spaced insulators.

A further object of the invention is the provision of such a combination of service cable and insulator which will effect a substantial saving in material and time of installation over the conventional method employing three or more separate conductor lines.

A further very important object of the invention is the provision of such a cable and insulator wherein the unwrapping of the cable and the slipping of the conductor cables down the bare central or neutral conductor is eliminated.

Still other objects reside in the combinations of elements, arrangements of parts, and features of construction, all as will be more fully pointed out hereinafter, nad disclosed in the accompanying drawing wherein there is shown a preferred embodiment of this inventive concept.

In the drawing:

Figure l discloses a triplex or multiple conductor cable comprised of two insulated conductors twisted around a bare neutral conductor, shown in association with the insulator of the instant invention.

Figure 2 is a sectional view taken substantially along the line 22 of Figure 1 as viewed in the direction indicated by the arrows.

Figure 3 is an enlarged sectional view taken substantially along the line 3-3 of Figure 2 as viewed in the direction indicated by the arrows.

Figure 4 is a top plan view of the support for the insulator, shown as disassociated from the cable and the insulator per se.

Similar reference characters refer to similar parts throughout the several views of the drawing.

Having reference now to the drawing in detail, there is generally indicated at a multiple service conductor which comprises two insulated conducting strands 11, each of which is comprised of a central conductive wire 12 and an outer insulating coating 13, and a central bare nonconductive wire 14. The wire 14 is preferably comprised of aluminum strands 15, surrounding a central high tensile strength steel core. The strands 11 are ice intertwined about the strand 14, the latter being adapted to be connected at its opposite ends to the service facilities of the electric company, as for example an electric pole, and at its other end to the consumers building.

By use of such a multiple service connector, the in stallation of a plurality of individual conductors together with their associated conventional strain insulators and the like is obviated. One disadvantage of a multiple conductor is the intertwined strands 11 have a tendency to unravel from their intertwined position about the bare service cable 14, or slip along the length thereof when the insulation is made at an angle.

By virtue of the instant invention such slippage and unwrapping is obviated.

At each end of the service cable there is provided a clamp generally indicated at 20, which comprises upper and lower segments 21 and 22, together with a connecting bracket 23, which is provided with inner engaging extremities 24 exteriorly threaded to accommodate a clamping nut 25 of conventional type. The lower bracket 22 is adapted to compress a supporting member 26 closely against the under side of the bare service cable 14, the opposite end of the member 26 being suitably secured to either the pole or the consumers building.

The upper clamping bracket 21 is adapted to engage and clampingly hold the end 27 of an offset support arm 28. The arm 28 has another end 29, which is substantially parallel to the end 27 which has secured thereto in any desired manner, as by rivets 30 or the like, an arcuate flange 31, which is provided adjacent its curved ends with suitable apertures 32.

The inner or concave surface of the flange 31 is adapted to engage the outer surface of a circular porcelain insulator 35 having a central aperture 36 therein, through which are adapted to extend the insulated wires 11 and the non-insulated supporting or service cables 14, as best shown in Figure 2. The outer surface of insulator 35 is provided with a peripheral groove or channel 37, in which is adapted to be seated a wire 38. The wire 38 is extended, as best shown in Figures 1 and 3 through the openings 32 in the flange 31.

The ends of the relatively rigid wire 38 are reverted as generally indicated at 39 in Figures 1 and 2, thus securely holding the insulator 35 in related assembly with the flange 31 of the bracket 28. It will thus be seen that the insulator 35 passes completely about the cables 11 and 14, and that between the clamping ring 20 and the insulator 35 the conductive cables extend downwardly either to the pole, or the building of the consumer, and that due to the relatively tight constriction of the aperture 36 of the insulator 35, slippage or further unravelling of the conductive insulated cables 11 relative to the support or service cable 14 is positively precluded.

From the foregoing it will now be seen that there is herein provided a device which accomplishes all of the objects of this invention, and others, including many advantages of great practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as many modifications may be made in the embodiment herein before shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrative and not in a limiting sense.

What is claimed is:

In an insulator for multiple service cable's including a plurality of insulated conductive wires intertwined about a non-insulated non-conducting supporting cable, said insulator comprising a clamping ring adapted to be clamped about said supporting cable, an offset supporting member clamped to said non-insulated supporting cable by said clamping ring, an arcuate flange having References @iteai in the file of this patent apertures at its end secured to said offset member, a torus v m shaped insulator having an annular external groove seated UNiTED STATES PATENTS in said arcuate flange and a wire seated in said groove 1,945,488 Lavarack et al Jan. 30, 1934 having its ends extending through said apertures and 5 2,210,722 Klein Aug. 6, 1940 reverted to hold said insulator and said flange in related 2,296,679 Mack Sept. 22, 1942 assembly, said wires and said supporting cable extending 2,473,965 Morrison et al June 21, 1949 through the opening in said insulator. 

